diff --git a/src/boolean_evaluation/tests.rs b/src/boolean_evaluation/tests.rs
index 3ecffe4..daa6150 100644
--- a/src/boolean_evaluation/tests.rs
+++ b/src/boolean_evaluation/tests.rs
@@ -18,6 +18,15 @@ mod tests {
 
     }
 
+    #[test]
+    fn chained_unary() {
+        assert_eq!(eval_formula("1!!"), true);
+        assert_eq!(eval_formula("0!!"), false);
+        assert_eq!(eval_formula("0!!!"), true);
+        assert_eq!(eval_formula("1!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"), true);
+
+    }
+
     #[test]
     fn binary_and_uneray() {
         assert_eq!(eval_formula("10&!"), true);
diff --git a/src/main.rs b/src/main.rs
index b32469d..79b9e84 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,6 +2,7 @@ mod adder;
 mod multiplier;
 mod gray_code;
 mod boolean_evaluation;
+mod truth_table;
 mod ast;
 
 use gray_code::gray_code;
diff --git a/src/truth_table,rs b/src/truth_table,rs
deleted file mode 100644
index e69de29..0000000
diff --git a/src/truth_table.rs b/src/truth_table.rs
new file mode 100644
index 0000000..3ec29f5
--- /dev/null
+++ b/src/truth_table.rs
@@ -0,0 +1,92 @@
+mod tests;
+
+use std::collections::HashSet;
+use crate::ast::{ Token, Node, add_unary_node, add_binary_node };
+
+fn parse_formula(formula: &str) -> Node<bool> {
+    let mut stack = vec![];
+    for c in formula.chars() {
+        match c {
+            '0' => stack.push(Node::Leaf(false)),
+            '1' => stack.push(Node::Leaf(true)),
+            '!' => add_unary_node(&mut stack, Token::Negation),
+            '&' => add_binary_node(&mut stack, Token::Conjunction),
+            '|' => add_binary_node(&mut stack, Token::Disjunction),
+            '^' => add_binary_node(&mut stack, Token::ExclusiveDisjunction),
+            '>' => add_binary_node(&mut stack, Token::MaterialCondition),
+            '=' => add_binary_node(&mut stack, Token::LogicalEquivalence),
+            _ => panic!("Error: {} is not a valid character", c)
+        }
+    }
+    stack.pop().unwrap()
+}
+
+fn compute(operator: Token, lhs: bool, rhs: bool) -> bool {
+    match operator {
+        Token::Negation => !lhs,
+        Token::Conjunction => lhs & rhs,
+        Token::Disjunction => lhs | rhs,
+        Token::ExclusiveDisjunction => lhs ^ rhs,
+        Token::MaterialCondition => !(lhs && !rhs),
+        Token::LogicalEquivalence => lhs == rhs
+    }
+}
+
+fn evaluate(tree: Node<bool>) -> bool {
+    match tree {
+        Node::Unary { operator, operand } => compute(operator, evaluate(*operand), false),
+        Node::Binary { operator, lhs, rhs } => compute(operator, evaluate(*lhs), evaluate(*rhs)),
+        Node::Leaf(b) => b,
+    }
+}
+
+fn get_hashset(formula: &str) -> HashSet<char> {
+    let mut hashset = HashSet::new();
+
+    for c in formula.chars() {
+        match c {
+            'A'..='Z' => { hashset.insert(c); },
+            '!' | '&' | '|' | '^' | '>' | '=' => (),
+            _ => panic!("Error: {} is not a valid character", c),
+        }
+    }
+    hashset
+}
+
+fn eval_formula(formula: &str) -> bool {
+    let tree = parse_formula(formula);
+    evaluate(tree)
+}
+
+fn recursive_fn(formula: &str, mut vec: Vec<char>, format: String) {
+    let char = vec.pop();
+    if let Some(c) = char {
+        recursive_fn(formula.replace(c, "0").as_str(), vec.clone(), format!("{format} 0 |"));
+        recursive_fn(formula.replace(c, "1").as_str(), vec.clone(), format!("{format} 1 |"));
+    } else {
+        match eval_formula(formula) {
+            false => println!("{format} 0 |"),
+            true => println!("{format} 1 |"),
+        }
+    }
+}
+
+fn print_truth_table(formula: &str) {
+    let set: HashSet<char> = get_hashset(formula);
+    let mut vec: Vec<char> = set.iter().cloned().collect();
+    vec.sort();
+    let mut format = String::from("|");
+    let mut separator = String::from("|");
+    for i in vec.clone() {
+        format = format!("{format} {i} |");
+        separator = format!("{separator}---|");
+    }
+
+    format = format!("{format} = |");
+
+    separator = format!("{separator}---|");
+    println!("{format}");
+    println!("{separator}");
+    recursive_fn(formula, vec, String::from("|"));
+    // call eval formula a lot 
+}
\ No newline at end of file
diff --git a/src/truth_table/tests.rs b/src/truth_table/tests.rs
new file mode 100644
index 0000000..e092e43
--- /dev/null
+++ b/src/truth_table/tests.rs
@@ -0,0 +1,28 @@
+#[cfg(test)]
+mod tests {
+    use crate::truth_table::print_truth_table;
+
+    #[test]
+    fn only_binary() {
+        print_truth_table("AB&");
+        print_truth_table("AB|");
+        print_truth_table("AB>");
+        print_truth_table("AB=");
+        print_truth_table("ABCD||=");
+    }
+
+    #[test]
+    fn only_unary() {
+        print_truth_table("A!");
+    }
+
+    #[test]
+    fn binary_and_uneray() {
+        print_truth_table("AB&!");
+    }
+
+    #[test]
+    fn big() {
+        print_truth_table("AB&CD&&EF&GH&&&IJ&KL&&MN&OP&&&QR&ST&&UV&WX&&&YZ&&&")
+    }
+}